Used in:

3.5-inch Rocket Head Mk 10 (Window)

3.5-inch Rocket Head Mk 14 (Window)

3.5-inch Rocket Head Mk 15 (Window)

3.5-inch Rocket Head Mk 15 (Flare)

Overall dimensions and weight of fuze:

Length

Diameter (maximum)

Weight

Applicable specification: OS 3541

General arrangement drawing: 447337

Sketch list of drawing & specs: 165013

Explosive components:

20 grams of black powder.

Ensign Bickford Fuse with quickmatch.

General. Fuze Mk 134 Mod 0 consists of a closed plastic case containing 20 grams of black powder and a lenght of Ensign Bickford Fuse having one end exposed. The Ensign Bickford Fuse is sheathed in Irvolite tubing; one sheathed end is inserted in the base of the plastic container so it projects approximately 3/16 of an inch, and the other end is surrounded by the black powder in the case. The exposed end of the tubing is cemented in place to the plastic case, and the projecting fuse it slit and receives a length of quick-match. The fuse and quickmatch are clamped together with a fuse clamp.

Use. Fuze Mk 134 Mod 0 is used in the 3.5-inch Window Fin Stabilized Surface Rock-ets (Complete Rounds) Mk 4 Mod 1, Mk 4 Mod 2, Mk 4 Mod 3, Mk 4 Mod 4, Mk 4 Mod 5, and Mk 4 Mod 8 (see OP 1415).

Figure 49 – Fuze Mk 134 Mod 0 (Ejector Delay), External View

Firing. The 3.5-inch Rocket Heads Mk 10, Mk 14, or Mk 15 have at their base a clo-sure-adapter also serves to carry the ignition system which ignites the Fuze Mk 134 Mod 0. The ignition system consists of a copper diaphragm, to the center of which is fix-ed a small firing pin. Pressure from the burning of the rocket motor propellant, upon ignit-ion forces the diaphragm forward and the firing pin strikes the primer of a modified .32 caliber blank cartridge. The flash from the .32 caliber cartridge ignites the exposed end of the Ensign Bickford Fuse. After this fuse burns of approximately 15 seconds, it ignites the black powder and ejects the rocket head load.

Figure 50 – Fuze Mk 134 Mod 0 (Ejector Delay), Cross Section View

General. The collapse of the diaphragm is neccessary to initiate the fuze. Fuze Mk 134 Mod 0 is considered safe during normal handling and stowage.

General. Since the Fuze Mk 134 Mod 0 is assembled within the rocket head there is no way of determining its condition by external observation. Damaged rocket heads con-taining Fuze Mk 134 shall be disposed of by lowering into deep water or by Explosive Dis-posal Personnel in accordance with existing instructions.

Disassembly. Disassembly of this fuze is not permitted except at authorized activit-ies when directed by the Bureau of Ordnance

The Fuze Mk 134 Mod 0 is installed in the rocket head by the loading activity.

Packing. The fuze is shipped assembled in the rocket head.

Marking. Each Fuze Mk 134 Mod 0 is marked or stamped with the mark, mod, lot num-ber, the date of loading, and the symbol of the loading activity.